Lenco L75 Help. - diyAudio
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Old 17th July 2004, 08:54 AM   #1
streams is offline streams  New Zealand
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Default Lenco L75 Help.

I was given a Lenco L75 TT. The heavy platter type. The styli looked worn, so I had it replaced with a new one. When playing an LP it emits a high pitched whine/sqeak, which is then amplified through the speakers. I am sure there is nothing rubbing. And I am sure it does not come from the table as you can only hear it when the needle is on the record.

As it gets further throught the record it becomes intermittent and then disappears altogether. Apart from the whine it sounds fine.

Any thoughts as to what might be happening?

Thanks.
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Old 18th July 2004, 11:09 PM   #2
streams is offline streams  New Zealand
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Is it possible that the bearings in the tonearm need oiling? When I move the arm I cant hear a sqeak.

Perhaps I need a new cartridge. When I had the styli replaced the person said he had never heard of anyone changing a cartridge. which I found quite strange.
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Old 18th July 2004, 11:59 PM   #3
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I'm not clear where this sound is coming from.
Is it coming through the speakers?
Is it mechanical?
Does it get louder or softer if you turn the volume knob?
If it's coming through the system, is it one channel or both?
There are numerous possibilities as to what's causing the noise. It could be dry or worn bearings. It could be that you have an intermittant open ground connection, which would leave the signal lead squealing. The motor could be giving trouble (again, could be the bearings).
Without more specific information, it's difficult to say.
I used to own a Lenco and had trouble with the signal leads in the tonearm. Whether that was true for all the others I couldn't say, as I was the only person I knew who owned one.
All things being equal, the stylus is the part that wears out. It's the part you replace. That's not to say that people don't replace the entire cartridge from time to time, but usually to upgrade the cartridge...not because it's worn out.

Grey
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Old 19th July 2004, 01:15 AM   #4
streams is offline streams  New Zealand
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The sound is coming from both the styli or tonearm (its hard to tell exactly) and is then heard through the speakers. Yes, when you turn up the volume it does get louder. It seems to be more prominent on certain records.

I have put a ground wire from the tonearm to the amp GND. This removed the hum from the amp, but the other problems remain.
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Old 19th July 2004, 03:09 AM   #5
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Doubt that it is the tonearm bearings. If I remember.....mine had knife-edge bearings. Not a whole lot that can go wrong.

No idea what it is.

Jocko
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Old 19th July 2004, 08:13 AM   #6
streams is offline streams  New Zealand
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The sqealing and distortion makes it unbearable to listen to. I will take it back to the shop where I had the Stylus replaced and see if they can fix it.

Im going through vinyl withdrawal. Might have to pull out my cheap plastic TT.
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Old 19th July 2004, 10:39 AM   #7
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Overload of the preamp?
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Old 19th July 2004, 10:53 AM   #8
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The arm on the L75 is indeed a knife edge bearing...BUT...the knife edges on the arm locate in elastomeric (soft plastic) V-blocks.

These degrade badly and you often see arms on L75s at an angle, 'cause one of the plastic V-blocks has disintegrated.

I don't think replacements are available.
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Old 19th July 2004, 09:39 PM   #9
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Ok, distortion problem solved. The cartridge is ceramic and I have it connected to my magnetic amp.

I will have the cartridge changed. It may even fix the squeak.
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Old 24th July 2004, 08:44 AM   #10
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I now have a new AudioTechnica cartridge and it sounds beautiful.
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